Time Multiplexed Stereoscopic Display for HMDs
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Solution Overview
Problem
Current head-mounted display technologies fail to combine high resolution, large field of view, low weight, and compact dimensions, resulting in incomplete or uncomfortable user experiences due to low realism, eye strain, and excessive pressure.
Innovation Solution
Implementing a single digital display shared between both eyes using Time Division Multiplexing (TDM) with free-form optical designs and electronic shutters, allowing for asymmetric configurations and efficient use of optical channels to maximize pixel count and reduce optical crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a single digital display is shared between both eyes using Time Division Multiplexing, then the pixel count for each eye is maximized and weight is reduced, but optical cross-talk occurs and requires precise control
Solution Approach 1:
The patent applies time division multiplexing to periodically switch between displaying content for the left eye and right eye. The display alternates between two states (first and second sub-frames) at a rate synchronized with eye-tracking, allowing full pixel utilization for each eye while preventing cross-talk through temporal separation of optical paths.
Solution Approach 2:
The system uses eye-tracking to continuously monitor the user's gaze and dynamically adjusts which optical channel is active and which display regions are rendered. This feedback mechanism ensures that light is directed only to the appropriate eye at the appropriate time, eliminating optical cross-talk while maximizing pixel usage efficiency.
2Manufacturing precision
If asymmetric optical channel configurations are used to maximize pixel usage, then stereoscopic vision quality improves, but device complexity increases
Solution Approach 1:
The patent implements dynamic optical channel switching based on real-time eye-tracking data. The system transitions from static optical configurations to dynamic ones where channels are activated or deactivated depending on the current gaze direction and required stereoscopic content, simplifying the physical optics while maintaining high vision quality through computational control.
3Weight of moving object
If time multiplexing is used to share the display between eyes, then weight and dimensions are reduced, but the switching speed must be very fast to avoid visible artifacts
Solution Approach 1:
The system maintains continuous display operation by rapidly alternating between left-eye and right-eye content at frequencies synchronized with human visual persistence. The useful action (image rendering) continues without interruption, just switching between temporal sub-frames fast enough to prevent perceivable artifacts while maintaining the lightweight single-display architecture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables stereoscopic vision with full pixel usage for each eye, reducing eye strain and enhancing immersion while maintaining a compact and lightweight design.
Implementation Method 1
Each channel is formed by one or more optical surfaces... The channel is designed to form a continuous image of its cluster's o-pixels into i-pixels
Implementation Method 2
optical systems, which image the displays into a virtual screen
Implementation Method 3
When shutters are used, the channels of the same channel bundle may share the same shutter or may have synchronous shutters
Data Source
AI summary
A display device includes a display operable to generate a real image and an optical system including: a plurality of optical channel bundles, each bundle comprising one or more channels, each channel comprising a lenslet arranged to generate a sub-image from a respective partial real image on the display, Each lenslet is configured to project light from the display to a corresponding eye position among two eye positions. The sub-images combine to form two virtual images so that different optical channel bundles image a same portion of the display to different portions of the virtual images. The optical system is configured to allow light to flow through selected channels and prevent, light from flowing through other selected channels. The system successively opens the optical channel bundles and displays partial real images associated with the channels of the corresponding optical channel bundle.